swift 4 @objc inference

[serge-glance]

In Xcode build settings is "default" for the "Swift 3 @objc Inference" compiler code generation for swift 4.
This causes an error when building and an @objc needs to be added to the front of:
dynamic fileprivate func textFieldDidChange(_ notification: Foundation.Notification)
in KWTextFieldView

in order to compile.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[kpavankotesh]

Fixed in #26